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W. H. FURRY AND N. F. RAMSEYfollowing statements can be made about the effects of the potentials in quantum theory : 1. These effects change only the phase of the wave function, and the phase changes are independent of the kinetic energy and kinetic momentum of the particle. Thus they are intrinsically quantum-mechanical effects, with no analog in classical theory.2. These effects do not affect the gauge invariance of the theory.3. These effects can have objective meaning only when they act differently on different parts of the wave function of the same particle. A classical particle could show effects of an electrostatic potential difference or a PHYSICAL REVIEW A method previously described is used to calculate the probability distribution of the low-frequency component of the electric field at a neutral point, the distribution of the low-frequency component at an ion, and that of the high-frequency component at an electron. The results are compared with those obtained by other authors. ELECTRIC FIELDDISTRIBUTIONS IN IONIZED GAS. II 627

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Measurements have been made of the cluster diffuse neutron scattering from a polycrystalline sample of Cuo.52sNi 62